Question

Throwing A ball: A ball is thrown vertically from ground level with an initial speed of 108 ft/s.
A. When will the ball hit the ground?
B. When will the ball be 180 ft above the ground?

h=-16t^2VT+H

Answer 1

I mean
h=-16t^2+Vt+h

Answer 2

V = Vo + g*Tr = 0 at max h.
Tr = -Vo/g = -108/-32 = 3.375 s. = Rise
time.

Tf = Tr = 3.375 s. = Fall time.

A. T = Tr+Tf

B. h = Vo*t + 0.5g*t^2 = 180 Ft.
108t - 16t^2 - 180 = 0.
-16t^2 + 108t - 180 = 0.
Use Quad. Formula.
t = 3.0 s.